| Message ID | 1311841821-10252-6-git-send-email-j-pihet@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thursday, July 28, 2011, jean.pihet@newoldbits.com wrote: > From: Jean Pihet <j-pihet@ti.com> > > The devices latency constraints class of PM QoS is storing the > constraints list in the device dev_pm_info struct. > > This patch adds the init and de-init of the per-device constraints > list in order to support the dynamic insertion and removal > of the devices in the system. > > Signed-off-by: Jean Pihet <j-pihet@ti.com> > --- > drivers/base/power/main.c | 10 ++++------ > include/linux/pm.h | 1 + > include/linux/pm_qos.h | 2 ++ > kernel/pm_qos.c | 30 ++++++++++++++++++++++++++++++ > 4 files changed, 37 insertions(+), 6 deletions(-) > > diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c > index 360c2c0..c86f97c 100644 > --- a/drivers/base/power/main.c > +++ b/drivers/base/power/main.c > @@ -97,12 +97,8 @@ void device_pm_add(struct device *dev) > dev_name(dev->parent)); > list_add_tail(&dev->power.entry, &dpm_list); > mutex_unlock(&dpm_list_mtx); > - plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); > - dev->power.latency_constraints.target_value = > - PM_QOS_DEV_LAT_DEFAULT_VALUE; > - dev->power.latency_constraints.default_value = > - PM_QOS_DEV_LAT_DEFAULT_VALUE; > - dev->power.latency_constraints.type = PM_QOS_MIN; > + /* Call PM QoS to init the per-device latency constraints */ > + pm_qos_dev_constraints_init(dev); > } > > /** > @@ -113,6 +109,8 @@ void device_pm_remove(struct device *dev) > { > pr_debug("PM: Removing info for %s:%s\n", > dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); > + /* Call PM QoS to de-init the per-device latency constraints */ > + pm_qos_dev_constraints_deinit(dev); I'd call this function "dev_pm_qos_constraints_destroy()" (and the previous one "dev_pm_qos_constraints_init()" for consistency). > complete_all(&dev->power.completion); > mutex_lock(&dpm_list_mtx); > list_del_init(&dev->power.entry); > diff --git a/include/linux/pm.h b/include/linux/pm.h > index 35e48a3..3ed53be 100644 > --- a/include/linux/pm.h > +++ b/include/linux/pm.h > @@ -466,6 +466,7 @@ struct dev_pm_info { > void *subsys_data; /* Owned by the subsystem. */ > #endif > struct pm_qos_constraints latency_constraints; > + int latency_constraints_init; > }; > > extern void update_pm_runtime_accounting(struct device *dev); > diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h > index d72b16b..4d36537 100644 > --- a/include/linux/pm_qos.h > +++ b/include/linux/pm_qos.h > @@ -63,4 +63,6 @@ int pm_qos_add_notifier(int class, struct notifier_block *notifier); > int pm_qos_remove_notifier(int class, struct notifier_block *notifier); > int pm_qos_request_active(struct pm_qos_request *req); > > +void pm_qos_dev_constraints_init(struct device *dev); > +void pm_qos_dev_constraints_deinit(struct device *dev); > #endif > diff --git a/kernel/pm_qos.c b/kernel/pm_qos.c > index 7edc6d0..361fc3f 100644 > --- a/kernel/pm_qos.c > +++ b/kernel/pm_qos.c > @@ -202,6 +202,9 @@ static void update_target(struct pm_qos_request *req, > WARN(1, KERN_ERR "PM QoS API called with NULL dev\n"); > return; > } > + /* Silently return if the device is being released */ > + if (!req->dev->power.latency_constraints_init) > + return; > c = &req->dev->power.latency_constraints; > break; > case PM_QOS_CPU_DMA_LATENCY: > @@ -387,6 +390,33 @@ int pm_qos_remove_notifier(int class, struct notifier_block *notifier) > } > EXPORT_SYMBOL_GPL(pm_qos_remove_notifier); > > +/* Called from the device PM subsystem at device init */ > +void pm_qos_dev_constraints_init(struct device *dev) > +{ > + plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); > + dev->power.latency_constraints.target_value = > + PM_QOS_DEV_LAT_DEFAULT_VALUE; > + dev->power.latency_constraints.default_value = > + PM_QOS_DEV_LAT_DEFAULT_VALUE; > + dev->power.latency_constraints.type = PM_QOS_MIN; > + dev->power.latency_constraints_init = 1; You could avoid adding this field if there were a PM_QOS_UNINITIALIZED (or PM_QOS_UNKNOWN) type. And if you _really_ want to have a separate field, why don't you put it into latency_constraints ? > +} > + > +/* Called from the device PM subsystem at device release */ > +void pm_qos_dev_constraints_deinit(struct device *dev) > +{ > + struct pm_qos_request *req, *tmp; > + > + dev->power.latency_constraints_init = 0; > + > + /* Flush the constraints list for the device */ > + plist_for_each_entry_safe(req, tmp, > + &dev->power.latency_constraints.list, > + node) > + update_target(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); > + plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); > +} > + > static int register_pm_qos_misc(struct pm_qos_object *qos) > { > qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR; > Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Rafael, 2011/7/31 Rafael J. Wysocki <rjw@sisk.pl>: > On Thursday, July 28, 2011, jean.pihet@newoldbits.com wrote: ... >> @@ -113,6 +109,8 @@ void device_pm_remove(struct device *dev) >> { >> pr_debug("PM: Removing info for %s:%s\n", >> dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); >> + /* Call PM QoS to de-init the per-device latency constraints */ >> + pm_qos_dev_constraints_deinit(dev); > > I'd call this function "dev_pm_qos_constraints_destroy()" (and the previous > one "dev_pm_qos_constraints_init()" for consistency). Ok ... >> +/* Called from the device PM subsystem at device init */ >> +void pm_qos_dev_constraints_init(struct device *dev) >> +{ >> + plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); >> + dev->power.latency_constraints.target_value = >> + PM_QOS_DEV_LAT_DEFAULT_VALUE; >> + dev->power.latency_constraints.default_value = >> + PM_QOS_DEV_LAT_DEFAULT_VALUE; >> + dev->power.latency_constraints.type = PM_QOS_MIN; >> + dev->power.latency_constraints_init = 1; > > You could avoid adding this field if there were a PM_QOS_UNINITIALIZED > (or PM_QOS_UNKNOWN) type. > > And if you _really_ want to have a separate field, why don't you put it > into latency_constraints ? Ok I remove latency_constraints_init and use the type field instead. ... > > Thanks, > Rafael Thanks, Jean -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 360c2c0..c86f97c 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -97,12 +97,8 @@ void device_pm_add(struct device *dev) dev_name(dev->parent)); list_add_tail(&dev->power.entry, &dpm_list); mutex_unlock(&dpm_list_mtx); - plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); - dev->power.latency_constraints.target_value = - PM_QOS_DEV_LAT_DEFAULT_VALUE; - dev->power.latency_constraints.default_value = - PM_QOS_DEV_LAT_DEFAULT_VALUE; - dev->power.latency_constraints.type = PM_QOS_MIN; + /* Call PM QoS to init the per-device latency constraints */ + pm_qos_dev_constraints_init(dev); } /** @@ -113,6 +109,8 @@ void device_pm_remove(struct device *dev) { pr_debug("PM: Removing info for %s:%s\n", dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); + /* Call PM QoS to de-init the per-device latency constraints */ + pm_qos_dev_constraints_deinit(dev); complete_all(&dev->power.completion); mutex_lock(&dpm_list_mtx); list_del_init(&dev->power.entry); diff --git a/include/linux/pm.h b/include/linux/pm.h index 35e48a3..3ed53be 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -466,6 +466,7 @@ struct dev_pm_info { void *subsys_data; /* Owned by the subsystem. */ #endif struct pm_qos_constraints latency_constraints; + int latency_constraints_init; }; extern void update_pm_runtime_accounting(struct device *dev); diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index d72b16b..4d36537 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -63,4 +63,6 @@ int pm_qos_add_notifier(int class, struct notifier_block *notifier); int pm_qos_remove_notifier(int class, struct notifier_block *notifier); int pm_qos_request_active(struct pm_qos_request *req); +void pm_qos_dev_constraints_init(struct device *dev); +void pm_qos_dev_constraints_deinit(struct device *dev); #endif diff --git a/kernel/pm_qos.c b/kernel/pm_qos.c index 7edc6d0..361fc3f 100644 --- a/kernel/pm_qos.c +++ b/kernel/pm_qos.c @@ -202,6 +202,9 @@ static void update_target(struct pm_qos_request *req, WARN(1, KERN_ERR "PM QoS API called with NULL dev\n"); return; } + /* Silently return if the device is being released */ + if (!req->dev->power.latency_constraints_init) + return; c = &req->dev->power.latency_constraints; break; case PM_QOS_CPU_DMA_LATENCY: @@ -387,6 +390,33 @@ int pm_qos_remove_notifier(int class, struct notifier_block *notifier) } EXPORT_SYMBOL_GPL(pm_qos_remove_notifier); +/* Called from the device PM subsystem at device init */ +void pm_qos_dev_constraints_init(struct device *dev) +{ + plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); + dev->power.latency_constraints.target_value = + PM_QOS_DEV_LAT_DEFAULT_VALUE; + dev->power.latency_constraints.default_value = + PM_QOS_DEV_LAT_DEFAULT_VALUE; + dev->power.latency_constraints.type = PM_QOS_MIN; + dev->power.latency_constraints_init = 1; +} + +/* Called from the device PM subsystem at device release */ +void pm_qos_dev_constraints_deinit(struct device *dev) +{ + struct pm_qos_request *req, *tmp; + + dev->power.latency_constraints_init = 0; + + /* Flush the constraints list for the device */ + plist_for_each_entry_safe(req, tmp, + &dev->power.latency_constraints.list, + node) + update_target(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); + plist_head_init(&dev->power.latency_constraints.list, &dev->power.lock); +} + static int register_pm_qos_misc(struct pm_qos_object *qos) { qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR;